Clutter Control from Better Homes and Gardens January 2009

Daily - set aside 20 minutes in the morning to walk through the house & tidy up so you come home to a welcoming space.
Weekly - devote one afternoon to set housekeeping goals for the week ahead. Put chores in your calendar.
Monthly - go through kids school/art work. Save special items & toss the rest.
Seasonally - donate clothing you haven't worn in a couple of seasons.
Twice a year go through toys & donate what is no longer needed.

Now that I'm looking at this it doesn't seem extremely helpful but maybe it can give someone a start so I'll leave it up.
My personal tip is try to teach everyone to put things back where they get them from. If everything has it's own 'spot' it's less likely to get lost or make a mess somewhere.